SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e1e39ec559b7f55c87f70357a25200342bdc932cce8b35ffa985615b703adc' 
  AND token = 'YxIBT8V4YSunC+VZZK1rQR1CLNO+8mzKAf66/Mjl0g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}